Explain me ecg 10 common heart disease withchanges ecg and ecg images

Reading File

Finding Sources

Searching Images

ECG electrocardiogram changes heart disease

Finding Sources

Searching Images

atrial fibrillation ECG pattern

Searching Images

heart block ECG first second third degree

Reading File

Searching Images

left ventricular hypertrophy ECG voltage criteria

Searching Images

STEMI anterior myocardial infarction ST elevation ECG

Searching Images

ventricular tachycardia ventricular fibrillation ECG

Searching Images

pericarditis diffuse ST elevation saddle shaped ECG

Searching Images

Wolff-Parkinson-White WPW delta wave ECG short PR

Searching Images

pulmonary embolism right heart strain S1Q3T3 ECG pattern

Searching Images

hyperkalemia peaked T wave wide QRS ECG changes

I now have rich ECG images and data for all 10 conditions. Let me compose the comprehensive guide:

10 Common Heart Diseases: ECG Changes with Images

1. 🔴 ST-Elevation Myocardial Infarction (STEMI)

Mechanism: Complete occlusion of a coronary artery → transmural ischemia → injury current

Key ECG Changes:

Feature	Finding
ST segment	Convex ("tombstone") elevation ≥1 mm in ≥2 contiguous leads
Reciprocal changes	ST depression in opposite leads
Q waves	Pathological Q waves develop (>40 ms wide, >25% of R height)
T waves	Hyperacute (tall, peaked) early; later inversion
Location	Anterior (V1–V4 = LAD), Inferior (II, III, aVF = RCA), Lateral (I, aVL, V5–V6 = LCx)

ECG Image – Anterior STEMI (LAD Occlusion):

ST elevation V1–V6, hyperacute T waves, reciprocal depression inferiorly. Classic proximal LAD occlusion pattern.

"Tombstoning" ST elevation V2–V5 with evolving QS waves — extensive anterior STEMI.

2. 🟠 Inferior STEMI

Inferior STEMI with ST elevation II, III, aVF

Sinus tachycardia, ST elevation II, III, aVF, reciprocal ST depression I and aVL. Classic RCA inferior STEMI.

Key ECG Changes:

ST elevation in II, III, aVF (inferior leads)
Reciprocal ST depression in I and aVL (high lateral)
ST depression V1–V3 may suggest posterior involvement
Watch for right ventricular MI (check V3R, V4R)

3. 🟡 Subendocardial Ischemia / NSTEMI

Global subendocardial ischemia ST depression aVR elevation

Widespread horizontal ST depression V2–V6 and inferior leads + ST elevation in aVR — classic multivessel disease / left main stenosis pattern.

Key ECG Changes:

Feature	Finding
ST depression	Horizontal or downsloping ≥0.5 mm in ≥2 leads
T-wave changes	Inversion, biphasic
aVR	ST elevation (reciprocal to widespread subendocardial injury)
Q waves	Usually absent

4. 🔵 Atrial Fibrillation (AF)

Key ECG Changes:

Feature	Finding
Rhythm	Irregularly irregular RR intervals
P waves	Absent — replaced by fine fibrillatory (f) waves, best seen in V1
Ventricular rate	Variable (controlled <100 bpm; uncontrolled >100 bpm)
QRS	Usually narrow unless aberrant conduction

Coarse atrial fibrillation — chaotic f-waves replacing P waves, irregularly irregular QRS complexes.

AF with rate-dependent LBBB — irregular rhythm, wide QRS, discordant ST-T changes.

5. 🟣 Heart Block (AV Block)

Three Degrees:

Degree	ECG Finding
1st degree	PR interval >200 ms, every P conducts
2nd degree Mobitz I	Progressive PR lengthening until a QRS drops (Wenckebach)
2nd degree Mobitz II	Fixed PR, intermittent non-conducted P waves
3rd degree (Complete)	Complete AV dissociation — P and QRS independent, slow escape rhythm

AV blocks comparison chart - 1st, 2nd, 3rd degree

Comparison of first, second, and third-degree AV block — note progressive PR lengthening vs. dropped beats vs. complete dissociation.

Series showing: (a) complete heart block with ventricular escape at 41 bpm; (b) Mobitz II; (c) Wenckebach; (d) 1st degree AV block with PR >250 ms.

6. 🟤 Left Ventricular Hypertrophy (LVH)

Causes: Hypertension, aortic stenosis, hypertrophic cardiomyopathy

Key ECG Changes:

Criteria	Threshold
Sokolow-Lyon	SV1 + RV5 (or V6) ≥35 mm
Cornell voltage	RaVL + SV3 ≥28 mm (men), ≥20 mm (women)
Strain pattern	ST depression + T inversion in I, aVL, V5–V6
Left axis deviation	Common
P-mitrale	Broad, notched P wave

LVH Cornell voltage criteria with strain pattern

Cornell voltage LVH criteria — high RaVL, deep SV3, T-wave inversions lateral leads (strain pattern).

7. 🟢 Acute Pericarditis

Mechanism: Inflammation of pericardium → diffuse epicardial injury

Key ECG Changes (4 stages):

Stage	Timing	Finding
1	Hours–days	Diffuse concave ("saddle-shaped") ST elevation + PR depression
2	Days	ST normalizes, T-wave flattening
3	Weeks	T-wave inversions (diffuse)
4	Months	ECG normalizes

Distinguishing from STEMI:

ST elevation is diffuse (not territorial)
PR depression (most specific sign)
No reciprocal changes except aVR (ST depression in aVR + PR elevation)
Spodick's sign: downsloping TP segment

Pericarditis - diffuse saddle ST elevation and PR depression

Classic pericarditis — diffuse concave ST elevation I, II, III, aVF, V2–V6; PR depression in II; reciprocal changes in aVR; Spodick's sign present.

Pericarditis saddle-shaped ST elevation multiple leads

Widespread saddle-back ST elevation with PR depression — hallmark of acute pericarditis.

8. ⚡ Wolff-Parkinson-White (WPW) Syndrome

Mechanism: Accessory pathway (Bundle of Kent) bypasses AV node → ventricular pre-excitation

Key ECG Changes (Classic Triad):

Feature	Finding
PR interval	Short (<120 ms)
Delta wave	Slurred upstroke at onset of QRS
QRS	Widened (>120 ms) due to pre-excitation
ST-T changes	Secondary (discordant) repolarization changes
Risk	AF with rapid conduction → ventricular fibrillation

WPW - short PR, delta waves, widened QRS

Classic WPW triad — short PR interval, prominent delta waves II/III/aVF/V2–V6, widened QRS complexes.

WPW with left posteroseptal pathway — positive delta waves V1–V6, negative delta waves inferiorly mimicking inferior Q waves ("pseudoinfarction pattern").

9. 🫁 Pulmonary Embolism (PE)

Mechanism: Acute right heart strain from increased pulmonary vascular resistance

Key ECG Changes:

Feature	Finding
S1Q3T3	Deep S wave in lead I, Q wave in III, T inversion in III
Tachycardia	Sinus tachycardia (most common finding)
RBBB	Incomplete or complete right bundle branch block
T inversions	V1–V3 or V1–V4 (right ventricular strain)
Axis	Right axis deviation
P pulmonale	Tall P waves >2.5 mm in II (right atrial enlargement)

Classic S1Q3T3 — deep S in lead I, Q wave in III, inverted T in III. Sinus tachycardia with right ventricular strain.

Massive PE — S1Q3T3 + deep symmetric T-wave inversions V1–V6 (McGinn-White sign) indicating severe RV strain.

10. 🔋 Hyperkalemia

Mechanism: Elevated K⁺ → altered membrane potential → progressive conduction failure

Progressive ECG Changes by K⁺ Level:

K⁺ Level	ECG Finding
5.5–6.5 mEq/L	Tall, peaked ("tented") T waves — narrow base, most prominent V2–V4
6.5–7.5 mEq/L	P wave flattening/disappearance, PR prolongation
7.5–9.0 mEq/L	QRS widening, right axis deviation
>9.0 mEq/L	Sine-wave pattern, ventricular fibrillation, asystole

Early hyperkalemia (K⁺ 7.3 mEq/L) — tall narrow-based "tented" T waves V2–V4. Normal P waves and QRS still present.

Severe hyperkalemia (K⁺ 9.2 mEq/L) — absent P waves, markedly widened QRS, sine-wave pattern V2–V3. Pre-terminal rhythm.

Harrison's hyperkalemia ECG progression diagram

Progressive hyperkalemia ECG stages from Harrison's — mild (peaked T), moderate (P wave loss, QRS widening), severe (sine wave).

Quick Reference Summary Table

Disease	Key ECG Feature	Critical Sign
Anterior STEMI	ST↑ V1–V4 convex	Tombstone morphology
Inferior STEMI	ST↑ II, III, aVF	Reciprocal ↓ I, aVL
NSTEMI/Ischemia	ST depression, T inversion	aVR ST↑ = LM/3-vessel
Atrial Fibrillation	Irregularly irregular, no P waves	f-waves in V1
Complete Heart Block	AV dissociation	Escape <40 bpm
LVH	High voltage (SV1+RV5 ≥35 mm)	Strain pattern I, V5–V6
Pericarditis	Diffuse saddle ST↑	PR depression
WPW	Short PR + delta wave	Pseudo-STEMI risk in AF
Pulmonary Embolism	S1Q3T3, sinus tach	T inversion V1–V3
Hyperkalemia	Peaked T waves → sine wave	Wide QRS = emergency

Sources: Braunwald's Heart Disease (10th ed.) · Harrison's Principles of Internal Medicine (21st ed.) · Rosen's Emergency Medicine — ECG interpretation chapters; clinical ECG image library (PMC/Harrison's).

This is a shared conversation. Sign in to Orris to start your own chat.